► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />FT senior investment commentator John Authers examines why Japan’s stock market had such a volatile week. He looks at the effect of large sales orders by sovereign wealth funds affected by the low oil price.<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
